I'm working on CallStop, which is Superhuman for your phone number. Here's the app store link: https://apps.apple.com/us/app/callstop-call-manager/id145589...

The problem: spam calls. Most current solutions use blacklisting, which doesn't work well. CallStop uses whitelisting, and allows you to accept whitelist requests, pause filtering, or let groups use secret PIN "extensions" to reach you. You can revoke or edit these PINs at any time.

You can use CallStop to filter out 100% of spam on both cell phone numbers and landlines. CallStop has a free trial (30 days) and after that it's $6.99 per month. Right now, I have a paying user base and am working on scaling it.